The correct option is B Police arrest serial killer -- close case on abductions
The correct headline for the given context is Option B. This headline depicts the central idea and stands by the norms of a headline. Option A is incorrect as conjunctions are replaced by punctuation in a headline. Option C is incorrect due to the use of an article which is omitted in a headline. Option D denotes a different meaning due to the use of an infinitive, the statement is in past tense but 'to' in the headline denotes future tense.